| Japanese |
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| Title | 断層シンチカメラの点線源応答と深度分解能 |
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| Subtitle | 原著 |
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| Authors | 野原功全*, 田中栄一* |
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| Organization | *放射線医学総合研究所物理研究部 |
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| Journal | 核医学 |
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| Volume | 14 |
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| Number | 1 |
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| Page | 89-98 |
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| Year/Month | 1977/2 |
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| Article | 原著 |
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| Publisher | 日本核医学会 |
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| Abstract | 「I. 緒言」通常の平行多孔型コリメータを装着したシンチカメラで得られるRI画像は, 体内のいろいろな深さにおけるRI分布が検出器のシンチレータ面に重畳して投影され, RI分布の深さ方向の情報が失なわれている. それ故, その画像からある深さにおけるRI分布を知ることはできない. この平行多孔型コリメータの代わりに, 検出器の軸に対してある角度で孔をあけた斜平行多孔型コリメータをカメラに装着し, これを一定の角速度で回転させながらイメージを撮ることにより, その画像に深さ方向の情報をもたせることができる. この回転式コリメータを用いた断層イメージング法は舘野らをはじめFreedman, Muehllehnerらによって開発されたものであり, また, その後の理論的解析により装置の解像力や断層効果などの物理的諸特性が明らかになってきている. しかしながら, 今日に至ってもなお, その点線源応答や深さ方向の分解能を明確に表現する理論的な取扱いは欠けているように思われる. |
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| Practice | 臨床医学：一般 |
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| English |
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| Title | Point Source Response Function and Depth Resolution of Tomographic Scintillation Camera |
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| Subtitle | Original Articles |
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| Authors | Norimasa NOHARA, Eiichi TANAKA |
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| Authors(kana) | |
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| Organization | National Institute of Radiological Sciences |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 14 |
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| Number | 1 |
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| Page | 89-98 |
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| Year/Month | 1977/2 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | The point source response function is theoretically derived for a tomographic scintillation camera system consisting of an scintillation camera, a rotating slanted-hole collimator and a bed moving in a circular motion in synchronism with the rotataion of collimator. In the derivation the point spread function of the camera without the rotation of collimator is assumed to be a circular symmetric Gaussian function with standard deviation of σ. The point source response function of the tomographic camera is then given by G(χ, r; σ)=1/σ2exp(-χ2+r2/2σ2)I0(χr/σ2)where χ is the radial distance, r the radius of a circular image, and Io the modified zero-order Bessel's function. Comparison is made between the theoretical response function and esperimental results. Furthermore, a proposal is made of a simple definition to give the index of depth resolution of the tomographic camera. It is defined to be the distance between a focal plane and an adjacent plane in which the full width at half maximum of the point source response becomes twice as wide as that in the focal plane. Taking this definition, the present system with the 30°slanted hole collimator is found to have the depth resolution of 1.8cm in the focal plane at 10cm from the face of collimator. The value of the depth resolution is also discussed in comparison with results of phantom studies, and it is confirmed that the definition may be a resonable measure as the index of depth resolution, providing practical simplicity in measuring. |
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| Practice | Clinical medicine |
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